You can change your mobile number in Aadhaar card easily by visiting any Aadhaar Enrolment center and ask for an Aadhaar Enrolment or Correction form and you can update your new mobile number and submit it. You don’t need to provide any kind of proof for this process. 

Additional Reading: How To Link Aadhaar With Mobile Number

This process cannot be done online as per the new modifications. Only addresses can be updated online now. To update or change any other information you need to visit an Aadhaar Enrolment center. Aadhaar Card mobile number change or updation can be done by following the below-mentioned steps:

Step 1: Visit the Aadhaar Enrolment/Update Centre.

Step 2: Fill the Aadhaar Update Form or the correction form.

Step 3: Enter only your new mobile number in the form. You need not mention your old mobile number. 

Step 4: Your request will be submitted by the incharge.

Step 5: collect the acknowledgement slip containing the URN.

Step 6: Pay a total fee of Rs. 50 for availing this service.